Method and system for wireless charging in a portable terminal

ABSTRACT

A method for wirelessly charging a portable terminal using a Radio Frequency (RF) is provided. A charging system detects one or more portable terminals within a predetermined area, and preferably requests information needed for charging to the one or more portable terminals via short-range communication, receives the information in response needed for charging from each of the one or more portable terminals. A portable terminal to be wirelessly charged from among the one or more portable terminals is selected, based on the received information needed for charging, and the charging system transmits a predetermined RF for charging to the selected portable terminal.

CLAIM OF PRIORITY

This application claims priority under 35 U.S.C. §119(a) to a KoreanPatent Application filed in the Korean Intellectual Property Office onMar. 30, 2011 and assigned Serial No. 10-2011-0029124, the contents ofwhich are incorporated herein by reference in its entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a portable terminal, and moreparticularly, to a method and system for wireless charging the batteryin a portable terminal

2. Description of the Related Art

Due to the development of various, convenient functions of tablet PCssuch as Galaxy Tab, the i-Pad and smart phones, the proliferation ofsuch portable terminals have been widespread.

In particular, the inclusion of cameras, data communications, andmultimedia play functions in portable terminals coupled with decreasedcosts for such devices have caused their popularity to soar. However,the implementation of these types of functions rapidly consumes thebattery power of the portable terminals, which were not originallydesigned for powering such a conglomeration of items. Therefore, it isdesirable to permit a convenient re-charge of the battery of suchportable terminals.

To meet the ever-increasing demand to recharge portable devices, awireless charging technology for wirelessly charging the battery of aportable terminal was developed and this wireless charging technologyhas been implemented. The wireless charging technology obviates the needfor a peripheral device and a power connection cable to charge aportable terminal, thereby increasing convenience to users.

However, the conventional wireless charging technology just permitswireless charging of a portable terminal which is not a user friendlyprocess, without specifying a user-friendly wireless charging method fora portable terminal

SUMMARY OF THE INVENTION

Exemplary aspects of the present invention address at least some of theproblems and/or disadvantages and to provide at least the advantagesdescribed below. Accordingly, an aspect of the present invention is toprovide a method for enabling a user to wirelessly charge a portableterminal with a level of convenience unknown heretofore.

In accordance with an exemplary embodiment of the present invention,there is provided a method for wirelessly charging a portable terminalusing a Radio Frequency (RF), in which a charging system detects one ormore portable terminals within a predetermined area, requestsinformation needed for (i.e. associated with) charging to the one ormore portable terminals, receives the information associated withcharging from each of the one or more portable terminals, selects aportable terminal to be wirelessly charged from among the one or moreportable terminals based on the received information regarding chargingrequirements, and transmits a predetermined RF for charging to theselected portable terminal.

In accordance with another exemplary embodiment of the presentinvention, there is provided a system for wirelessly charging a portableterminal using an RF, in which a charging system detects one or moreportable terminals within a predetermined area, requests informationassociated with charging to the one or more portable terminals, receivesthe information associated with charging from each of the one or moreportable terminals, selects a portable terminal to be wirelessly chargedfrom among the one or more portable terminals, based on the receivedinformation associated with charging, and transmits a predetermined RFfor charging to the selected portable terminal, and the portableterminal notifies the charging system of the entry into thepredetermined area, when entering the predetermined area, transmits theinformation associated with charging to the charging system, and chargesa battery with the received RF.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other exemplary objects, features and advantages ofcertain illustrated embodiments of the present invention will becomemore apparent to a person of ordinary skill in the art from thefollowing detailed description taken in conjunction with theaccompanying drawings, in which:

FIG. 1 is a block diagram of a portable terminal according to anexemplary embodiment of the present invention;

FIG. 2 is a virtual view illustrating a connection state between acharging system and portable terminals according to an exemplaryembodiment of the present invention; and

FIG. 3 is a flowchart illustrating an operation for wirelessly charginga portable terminal according to an exemplary embodiment of the presentinvention.

Throughout the drawings, the same drawing reference numerals will beunderstood to refer to the same elements, features and structures.

DETAILED DESCRIPTION

Reference will now be made in detail to the preferred exemplaryembodiments of the present invention with reference to the accompanyingdrawings. The following description is given only of components and/oroperations required for a person of ordinary skill in the art tounderstand the present invention and the other background art will notbe described so as not to obscure the subject matter of the presentinvention.

A portable terminal according to an exemplary embodiment of the presentinvention comprises a mobile electronic device. The term “portableterminal” used herein covers a broad range of terminals, including butin no way limited to a video phone, a mobile phone, a smart phone, anInternational Mobile Telecommunications (IMT)-2000 terminal, a WidebandCode Division Multiple Access (WCDMA) terminal, a Universal MobileTelecommunication System (UMTS) terminal, a Personal Digital Assistant(PDA), a Portable Multimedia Player (PMP), a Digital MultimediaBroadcasting (DMB) terminal, a laptop computer, a tablet PC, etc., justto name some possibilities.

FIG. 1 is a block diagram of a portable terminal 100 according to anexemplary embodiment of the present invention. The portable terminal 100preferably includes a controller 10, a wireless transceiver 23, an audioprocessor 25, a keypad 27, a memory 30, a display 50, a short-rangecommunication module 60, and a wireless charger 70.

While the portable terminal shown in FIG. 1 does not have componentssuch as a Global Positioning System (GPS) module, an accelerationsensor, a proximity sensor, a geomagnetic sensor, a DMB receiver, and acamera module, it is clearly understood to those skilled in the art thatthey may be included in the portable terminal according to the presentinvention and provide their own functions. For example, the accelerationsensor (not shown) senses the movement state of the portable terminal bymeasuring dynamic force such as acceleration, vibration, impact, etc.The display direction of the display 50 of the portable terminal 100 maybe detected based on the sensed movement state of the portable terminal100. The proximity sensor (not shown) senses approach of a user's bodypart toward the portable terminal 100. The sensed information of theproximity sensor may be used to prevent malfunction of the portableterminal 100, if the portable terminal 100 provides a touch screenfunction. A gyroscope (not shown) monitors dynamic rotation of theportable terminal 100. The gyroscope may be used in conjunction with theacceleration sensor in order to sense rotational motion of the portableterminal 100 along six axes, specifically up and down, back and forth,side by side, and x-, y- and z-axis rotations.

With reference to FIG. 1, the wireless transceiver 23 preferablyincludes a Radio Frequency (RF) unit and a MODEM. The RF unit preferablyincludes an RF transmitter for upconverting the frequency of atransmission signal and amplifying the upconverted signal and an RFreceiver for low-noise-amplifying a received signal and downconvertingthe frequency of the low-noise-amplified signal. The MODEM preferablyincludes a transmitter for encoding and modulating the transmissionsignal and a receiver for demodulating and decoding the signal receivedfrom the RF unit.

The audio processor 25 shown in FIG. 1 may preferably include aCoder-Decoder (CODEC). The CODEC preferably includes a data CODEC and anaudio CODEC. The data CODEC processes packet data and the audio CODECprocesses an audio signal such as voice and a multimedia file. The audioprocessor 25 reproduces an audio signal by converting a digital audiosignal received from the MODEM to an analog signal through the audioCODEC, or converts an analog audio signal generated from a microphone toa digital audio signal through the audio CODEC and transmits the digitalaudio signal to the MODEM. The CODEC may be configured separately orincorporated into the controller 10.

With continue reference to FIG. 1, the keypad 27 may includealphanumerical keys for entering digits and characters, function keysfor setting functions, and a touch pad. If the display 50 is configuredinto a capacitive or resistive touch screen, the keypad 27 may beomitted or include a minimum number of keys. In this particular case,the display 50 may take charge of at least a part of key input functionsif the display is a touchscreen.

The memory 30 may preferably include a program memory and data memories.The program memory stores programs for controlling regular operations ofthe portable terminal 100. The memory 30 may preferably include anexternal memory such as a Compact Flash (CF) memory card, a SecureDigital (SD) card, a micro-SD memory card, a mini-SD memory card, aneXtreme Digital (XD) card, and a memory stick. The memory 30 may alsoinclude other types of non-transitory mediums including a disk such as aHard Disk Drive (HDD) and a Solid State Disk (SSD). Optical storage mayalso be employed.

The display 50 displays various types of information generated in theportable terminal 100. The display 50 may be various types of displayssuch as a Liquid Crystal Display (LCD), an Organic Light Emitting Diode(OLED) display (e.g. a Passive Matrix OLED (PMOLED) or Active MatrixOLED (AMOLED) display), or any type of Thin Film Technology screen, etc.The display 50 may also preferably include a touch screen (e.g.resistive, capacitive, etc.) that can be used not only as an outputdevice but also as an input device along with or instead of the keypad27.

With continued reference to FIG. 1, the short-range communication module60 enables short-range wireless network communication. The short-rangecommunication module 60 may preferably include at least one of a ZigBeemodule, an Ultra Wide Band (UWB) module, a Bluetooth module, a NearField Communication (NFC) module, or a Wireless Fidelity (Wi-Fi) module.In accordance with an exemplary embodiment of the present invention, theshort-range communication module 60 may notify a predetermined system ofentry of the portable terminal 100 into a specific area (e.g. a wirelesschargeable area) by a predetermined signal (e.g. a beacon signal). Inthis particular case, the short-range communication module 60 may beconfigured into an NFC module.

The wireless charger 70 charges a battery (not shown) of the portableterminal by converting a predetermined RF received from thepredetermined wireless charging system (e.g. a charging system 200) topower. The charged battery supplies an operating power to the portableterminal 100. It is preferable that the RF used for the wireless charger70 to charge the battery is different from an RF used in the wirelesstransceiver 23. Thus the portable terminal 100 can provide the user witha communication function through the wireless transceiver 23 and awireless charging function through the wireless charger 70, using thedifferent RFs. Meanwhile, a detailed structure of the wireless charger70 in relation to wireless charging is known in the art and thus willnot be described in detail herein.

The controller 10, which typically includes a microprocessor, providesoverall control to the portable terminal 100. The controller 10 mayswitch one operation of the portable terminal 100 to another operationaccording to a user input received through the keypad 27 or via thedisplay 50 and control the operations of the portable terminal 100. Inaccordance with the embodiment of the present invention, when theportable terminal 100 enters a specific area where wireless charging isavailable through the wireless charger 70 (e.g. a chargeable radius inFIG. 2), the controller 10 controls the charging system of the entry ofthe portable terminal 100 into the specific area through the short-rangecommunication module 60 or the wireless transceiver 23. In addition, thecontroller 10 controls transmission of information associated withcharging to the charging system 200 through the short-rangecommunication module 60 or the wireless transceiver 23, in response to arequest from the charging system 200. The controller 10 also controlsthe operation of the wireless charger 70 in order to charge the batteryof the portable terminal 100 using an RF received from the chargingsystem 200.

FIG. 2 is a virtual view illustrating a connection state between acharging system and portable terminals according to an exemplaryembodiment of the present invention.

Referring now to FIG. 2, the charging system 200 preferably includes amulti-band RF transceiver for operating in a plurality of frequencybands. The charging system 200 provides an RF-based wireless chargingfunction to a portable terminal within a chargeable distance, namely achargeable radius. In one example, the wireless charger 70 (shown inFIG. 1) receives the transmission via antenna (ANT 2) from the chargingsystem 200, provided that the portable terminals are within thechargeable radius.

The charging system 200 further includes an output level controller (notshown) for controlling the output level of an RF used to wireless chargea portable terminal Therefore, the charging system 200 may transmit anoutput level-controlled frequency (e.g. a frequency with an increased ordecreased output level) by controlling the output level controller andthe RF transceiver, thereby controlling the efficiency of wirelesscharging of a portable terminal

For example, if an RF output level is increased, a portable terminal maycharge its battery faster than at a lower RF output level. A detailedstructure of the charging system 200 for providing a wireless chargingfunction to portable terminals is also known in the art and thus willnot be described herein.

FIG. 3 is a flowchart illustrating an operation for wirelessly charginga portable terminal according to an exemplary embodiment of the presentinvention. The exemplary embodiment of the present invention will bedescribed below with reference to FIGS. 1, 2 and 3.

Referring now to FIGS. 1, 2 and 3, at (S301) the charging system 200determines whether a specific portable terminal has entered a wirelesschargeable area.

As illustrated in FIG. 2, when the portable terminal enters the wirelesschargeable area (e.g. the chargeable radius), the portable terminal maynotify the charging system 200 of its entry into the chargeable radiusby a specific signal (e.g. a beacon signal) through the short-rangecommunication module 60. Thus, the charging system 200 may be aware ofthe presence of the portable terminal within the chargeable radius. Inaddition, instead of the short-range communication module 60, theportable terminal may notify the charging system 200 of its entry intothe chargeable radius through the wireless transceiver 23.

In step S302, the charging system 200 requests the portable terminal toprovide information associated with charging the portable terminal, andalso receives the information from the portable terminal.

While the portable terminal is assumed to comprise a wirelesslychargeable in this exemplary embodiment of the present invention, someportable terminals may not have a wireless charging capability althoughthey are situated within the wireless chargeable area, considering theperformance of standard portable terminals that do not have wirelesscharging capability.

In addition, if the wireless charging service is membership-based, therecan be one or more portable terminal being capable of wireless chargingthat is situated in the wireless chargeable area, but having notsubscribed to the particular wireless charging service in the wirelesschargeable area and thus cannot be wirelessly charged via the particularwireless charging service.

Accordingly, upon receipt of the information associated with wirelesslycharging from the charging system 200, the portable terminal transmitsat least one of information indicating whether the portable terminal iswireless charging-enabled, and/or subscription information regarding thewireless charging service.

The subscription information may contain information indicating whetherthe portable terminal is subscribed to the particular wireless chargingservice, and authentication information related to the wireless chargingservice (e.g. an Identifier (ID) and a password) and may includeinformation about an RF channel used for wireless charging, if theportable terminal subscribed to the wireless charging service.

Furthermore, the portable terminal may transmit information indicating aresidual battery power level in the information associated with chargingin the exemplary embodiment of the present invention. Thus, the chargingsystem 200 may determine the battery charge state (e.g. a residualbattery power level) of the portable terminal based on informationprovided by the portable terminal. This information could affect, forexample, the output level of the wireless charging from charging system200 or a possible sequence of the portable terminals to receive suchwireless charging.

In the exemplary embodiment of the present invention, the portableterminal may further transmit information indicating activation ordeactivation of an automatic charging function that wirelessly chargesthe portable terminal without solicitation from the user, in theinformation associated with charging. Thus, the charging system 200 maydetermine whether the automatic charging function has been activated ornot in the portable terminal

In other words, upon receipt of a request for information associatedwith charging from the charging system 200, the portable terminal maytransmit to the charging system 200 information indicating whether ornot the portable terminal is wirelessly chargeable, subscriptioninformation regarding the wireless charging service, informationindicating a residual battery power level, and information indicatingwhether or not the automatic charging function has been activated. Thecharging system 200 can preferably communicate with the short-rangecommunication module 60 of the portable terminal 100, if said portableterminal is so equipped. Otherwise, the RF frequency of the wirelesstransceiver 23 can be used, if, for example, the portable terminal doesnot respond within a predetermined time (and/or predetermined number ofretries) at the RF frequency of the short-range communication.

Upon receipt of the information associated with charging, the chargingsystem 200 determines whether or not the portable terminal is wirelesscharging-enabled. If the charging system 200 determines that theportable terminal is wireless charging-enabled, the charging system 200performs a wireless charging-related operation for the portable terminalin steps S303, S304 and S305.

In S303, S304 and S305, the charging system may determine based on thereceived information associated with charging whether or not theportable terminal subscribed to the wireless charging service, whetherthe residual battery power level of the portable terminal is equal to orlower than a predetermined level, or whether the automatic chargingfunction has been activated for the portable terminal

Then the charging system 200 determines whether or not to provide thewireless charging service to the portable terminal that has entered thewireless chargeable area and transmitted the information associated withcharging in steps S303, S304 and S305.

For example, if the charging system 200 determines that the portableterminal has subscribed to the wireless charging service, and has aresidual battery power level equal to or lower than a predeterminedlevel (e.g. 50%), and is chargeable without a user's confirmation (e.g.a user's selection of an OK key for a displayed confirmation message)(e.g. the automatic charging function has been activated), the chargingsystem 200 can determine to provide the wireless charging service to theportable terminal automatically.

While steps S303, S304 and S305 are used to determine whether to providethe wireless charging service to the portable terminal, all of the stepsare not necessary. At least one of the steps may be performed to makethe determination.

For example, if the wireless charging service is free-of-charge, onlysteps S304 and S305 may be performed to determine whether to provide thewireless charging service to the portable terminal.

However, if wireless charging is performed irrespective of a residualbattery power level, only steps S303 and S305 may be performed todetermine whether to provide the wireless charging service to theportable terminal.

Moreover, if the portable terminal is to be automatically chargedwirelessly without a user's confirmation, that is, without activation ofthe automatic charging function, only steps S303 and S304 may beperformed to determine whether to provide the wireless charging serviceto the portable terminal

In addition, if step S303 is negative, the charging system can send anoffer to the portable terminal to join the charging service, or pay fora one-time charge. Thus the charging system may provide paymentinformation that is forwarded to a server for validation or processingof payment.

The user may determine whether or not to activate the automatic chargingfunction by menu setting. The user may set the wireless charging so thatthe portable terminal can be wirelessly charged only with the user'sconfirmation (e.g. only upon input of an OK key) or automaticallycharged wirelessly without the user's confirmation (e.g. charging in abackground state even though it is not noticed by the user). Even thoughthe wireless charging is in progress in the background state, theprogress of the wireless charging may be indicated to the user in theform of a predetermined icon displayed on an indicator bar of thedisplay screen.

The exemplary embodiment of the present invention may be modified sothat the determination is made as to whether to provide the wirelesscharging service to the portable terminal only in one of steps S303,S304 and S305. For example, the charging system 200 may determine toprovide the wireless charging service to the portable terminal, only ifit is determined that the portable terminal has a residual battery powerlevel equal to or lower than a predetermined level in step S304.

Subsequently, at S306 the charging system 200 transmits an RF forwireless charging to the portable terminal

As described above, once the charging system 200 determines to providethe wireless charging service to the portable terminal in at least oneof steps S303, S304 and S305, the charging system transmits an RF forwireless charging to the determined (selected) portable terminal. Thenthe portable terminal can charge its battery with the received RFthrough the wireless charger 70.

All of the steps S303, S304 and S305 are not required according toalternative exemplary embodiments of the present invention, aspreviously stated. If step S304 is included in an exemplary embodimentof the present invention, a portable terminal with a residual batterypower level equal to or lower than a predetermined level needs fastbattery charging. In this case, the charging system may increase theoutput level of an RF set for wireless charging of the portable terminaland transmits the RF at the increased output level to the portableterminal. Therefore, the portable terminal can charge its battery fasterwith the RF at the increased output level.

As is apparent from the above description of the present invention, auser can wirelessly charge a portable terminal with convenienceheretofore unknown.

When the residual battery power level of the portable terminal is equalto or lower than a predetermined level, the battery of the portableterminal can be charged wirelessly at a faster rate than a nominal rateby increasing the output level.

The above-described methods according to the present invention can berealized in hardware or as software or computer code that can be storedin a non-transitory recording medium such as, for example, a CD ROM, aDVD, a RAM, thumbnail drive, a floppy disk, a flash storage, a harddisk, or a magneto-optical disk or downloaded over a network, so thatthe methods described herein can be executed by such software using ageneral purpose computer, or a special processor, microprocessor or inprogrammable or dedicated hardware, such as an ASIC or FPGA. As would beunderstood in the art, the computer, the processor or the programmablehardware include memory components, e.g., RAM, ROM, Flash, etc. that maystore or receive software or computer code that when accessed andexecuted by the computer, processor or hardware implement the processingmethods described herein. In addition, it would be recognized that whena general purpose computer accesses code for implementing the processingshown herein, the execution of the code transforms the general purposecomputer into a special purpose computer for executing the processingshown herein.

While the present invention has been particularly shown and describedwith reference to exemplary embodiments thereof, it will be understoodby those of ordinary skill in the art that various changes in form anddetails may be made therein without departing from the spirit and scopeof the present invention as defined by the following claims.

1. A method for wirelessly charging a portable terminal using a RadioFrequency (RF), the method comprising: detecting by a charging systemone or more portable terminals within a predetermined chargeable area,requesting information associated with wireless charging to at least oneof the one or more portable terminals, and receiving in response by thecharging system the information associated with wireless charging fromeach said at least one or more portable terminals; selecting by thecharging system at least one portable terminal to be wirelessly chargedfrom among the at least one of the one or more portable terminals thatresponded to the previously-requested information, based on the receivedinformation associated with wireless charging by the charging system;and transmitting by the charging system a predetermined RF for chargingto the selected portable terminal by the charging system.
 2. The methodof claim 1, wherein the information associated with charging includesbattery information.
 3. The method of claim 2, wherein the batteryinformation includes a current storage level or a remaining capacitylevel.
 4. The method of claim 1, wherein the information associated withcharging includes information indicating whether the portable terminalis wirelessly chargeable.
 5. The method of claim 1, wherein theinformation associated with charging includes subscription informationregarding a wireless communication service, the subscription informationincluding at least one of information indicating whether the portableterminal is subscribed to the wireless charging service, authenticationinformation related to the wireless charging service, and informationabout an RF channel used for wireless charging.
 6. The method of claim1, wherein the information associated with charging includes informationindicating whether or not an automatic charging function has beenactivated for the portable terminal.
 7. The method of claim 5, whereinwhen the portable terminal responds that there is no subscription to thewireless charging service, or the portable terminal is subscribed to adifferent wireless charging service, the charging system prompts theportable terminal to display an offer to subscribe to the chargingservice at least to receive one battery charge from the charging system.8. The method of claim 7, wherein the offer is provided via a textmessage.
 9. The method of claim 1, wherein the selecting by the chargingsystem comprises selecting a portable terminal having a battery powerlevel equal to or lower than a predetermined level from among the one ormore portable terminals, based on the received information associatedwith charging.
 10. The method of claim 9, wherein the transmitting ofthe predetermined RF by the charging system comprises increasing anoutput level of the RF for charging and transmitting the predeterminedRF at the increased output level to the selected portable terminal inwhich a battery information provided to the charging system indicatesthat a battery power level of the selected portable terminal is equal toor lower than a predetermined level.
 11. A system for wirelesslycharging a portable terminal using a Radio Frequency (RF), the systemcomprising: a charging system that detects one or more portableterminals within a predetermined chargeable area, requesting informationassociated with wirelessly charging to the one or more portableterminals, receiving the information associated with charging from atleast one of the one or more portable terminals, selecting a portableterminal to be wirelessly charged from among the one or more portableterminals that previously responding to the charging system based on thereceived information associated with wirelessly charging the one or moreportable terminals, and transmitting a predetermined RF to the selectedportable terminal for charging; and the portable terminal for, whenentering the predetermined chargeable area, notifying the chargingsystem of the entry into the predetermined chargeable area, transmittingto the charging system the information associated with wirelesslycharging to the charging system, and charging a battery with thereceived RF.
 12. The system of claim 11, wherein the portable terminaland the charging system communicate via a short range communication. 13.The system of claim 11, wherein the charging system transmits the RF forcharging at a different frequency than a frequency in which the chargingsystem and the portable terminal communicate.
 14. The system of claim11, wherein the information associated with charging includes batteryinformation.
 15. The system of claim 14, wherein the battery informationincludes a current storage level or a remaining capacity level.
 16. Thesystem of claim 11, wherein the information associated with chargingincludes information indicating whether or not the portable terminalresponding is wirelessly chargeable.
 17. The system of claim 11, whereinthe information associated with charging includes subscriptioninformation regarding a wireless communication service, the subscriptioninformation including at least one of information indicating whether theportable terminal has subscribed to the wireless charging service,authentication information related to the wireless charging service, andinformation about an RF channel used for wireless charging.
 18. Thesystem of claim 11, wherein the information associated with chargingincludes information indicating whether or not an automatic chargingfunction has been activated for the portable terminal
 19. The system ofclaim 11, wherein the selected portable terminal has a battery powerlevel equal to or lower than a predetermined level from among the one ormore portable terminals.
 20. The system of claim 19, wherein thecharging system increases an output level of the RF for charging andtransmits the RF at the increased output level to a particular portableterminal having a battery power level equal to or lower than thepredetermined level.
 21. The system of claim 19, wherein when theportable terminal responds that there is no subscription to the wirelesscharging service, or the portable terminal is subscribed to a differentwireless charging service, the charging system prompts the portableterminal to display an offer subscribe to the charging service at leastto receive one battery charge from the charging system.
 22. A portableterminal having a wireless charging structure, said portable terminalcomprising: a wireless transceiver for receiving and transmittingwireless communication; an audio processor; a controller; a wirelesscharger unit that receives Radio Frequency (RF) for charging theportable terminal; a short-range communication unit for receiving andtransmitting charging information with a wireless charging system; and adisplay; wherein the controller controls the short-range communicationunit to transmit and receive information associated with receiving thecharging FR received by the wireless charger unit; and wherein thecontroller controls the display to output a text message prompting auser to subscribe to a particular charging service in a currentcommunicative range with the portable terminal at least to receive onewireless charge of the portable terminal.